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Josiah's 347 Stock Engine Rebuild - Completed Apr 2026

Josiah's 347 Stock Engine Rebuild - Completed Apr 2026

Josiah brought his Banshee engine into our shop for Virgil to take a look at it  He decided to have Virgil rebuild it with stock bore 64mm cylinders and a stock stroke 54mm crankshaft. That means this engine will be 347cc, or the same displacement as when it came from the factory. Yamaha marketed the 347cc Banshees as 350cc. First up, Virgil will be carefully inspecting all engine components.

Virgil knew the flywheel was torn up. 
The stator looks rough, so he needs to inspect the wires and test it.

Yep! This stator is TOAST! 

Once Virgil replaced all worn parts with new or quality used replacements, he assembled the engine. Now it’s time for the leak down test. Will it hold pressure? 

This 347 passed its leak down test with no problems. Virgil finished the engine assembly. Josiah’s 347 is BACK IN THE BANSHEE. He says it runs great. Now it’s time to RIDE. 

Watch the Project

Want to watch how this project came together?

  • 👀 Watch the video below. 
  • ⬇️Scroll down for the link to watch the project's full playlist on Youtube. 
  • ⬇️Keep scrolling to see the Project Specs below the video.

 

Q- QUESTIONS About Your Project?
A- You can call 📞📱 or message us at 541-419-6054. 

Project Specs

  • BUILD NAME:  Josiah's 347 Stock Engine Build
  • EXPECTED RIDING CONDITIONS:  Recreational dune & trail riding
  • DISPLACEMENT: 347cc
  • ENGINE CASE (CASE HALVES):  Stock Case
  • CYLINDERS:  Aftermarket - Bored to 64 mm
  • PORTED:  
  • PISTONS: Wiseco 64 mm - 513 Pro-Lite
  • CYLINDER HEAD:  Pro Design Cool Head
  • DOMES:  
  • CRANKSHAFT: Stock Crank 54 mm, trued and welded
  • COMPRESSION:   (determines fuel recommendation)
  • FUEL RECOMMENDATION: Premium Non-Ethanol (91-94 Octane) for 125-150 psi
  • TRANSMISSION:  Stock
  • REEDS / CAGE:  Stock - or - Moto Tassinari VForce4 Reed Valve System
  • CARBS:  Keihin PWK 28mm
  • CARB JETTING:  (varies based upon engine build and elevation)
  • NEEDLES:  CEL for Keihin PWK. 
  • NEEDLE CLIP SETTING:  Center Groove on Slide Needle
  • AIR SCREW ADJUSTMENT:  1-2 turns out
  • FLYWHEEL:  Stock
  • CLUTCH BASKET: Stock
  • CLUTCH: Stock Clutch
  • EXHAUST:  FMF Fatty
  • STATOR:  Ricky Stator - Round Plug  OR  Square Plug 
  • TIMING: 
  • GEARING: 13/43 Tooth Sprockets? - Click for Info on Banshee Sprockets and Gearing

 

 

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Do You Have a Project?

If you have a Banshee to restore, want to upgrade your suspension, or are planning an engine build, we're happy to help.

We specialize in Yamaha Banshees. If you have a different project in mind, contact us and we will let you know if we can take it on and what you can expect. 

CALL 📞📱 or message us at 541-419-6054. 

We offer a range of services. We can:

  1. Help you select parts for your DIY build.
  2. Help you Pack and Ship your Engine to us, build your engine, then ship it back to you to install.
  3. Complete the engine build for you and install in your Banshee.
  4. Inspect, repair and service the whole Banshee for you.
  5. Build or restore your Banshee.
  6. We may also be able to locate a local Banshee for you - then install your newly built engine in it.

Project References:

  • We calculate engine displacement based on the bore in the engine's cylinders and the stroke length of the crankshaft. Click here for more explanation in our Banshee Engine Displacement blog article. 
  • Click here for information about Banshee engine break-in procedures. This includes our recommendations for Fuel to Oil Ratios and Selecting the Correct Fuel.

About the Authors:

This project article was written by Janel with plenty of help from Virgil. Virgil is the Banshee mechanic, and I am the website mechanic. I do own and ride a Banshee, which helps. 

The Re-Do crew hopes sharing our project info and specs may help some with their own projects, or that you find it interesting. I want our technical info to be accurate and helpful.

Please do let us know if you like our project articles, or if you think I need to correct something. You can send an email to info@redo-parts.com - and your comments will be passed along to me. 

Thanks ~Janel 😉👌

Email to: info@redo-parts.com